Wishboard is a single-file Sinatra app that generates a wishlist based on a user's Pinboard account. If you have a pinboard account, you can generate your own wishlist here automatically by tagging items with want. If you know the wishlist that you want to see, you can get there either by using the form on this page, or by going directly to wishboard.co/[pinboard-username].
All the source code for this site is hosted on GitHub, and the app itself is hosted on a free instance at Heroku. If you would just like to see an example of what a wishlist looks like here, you can look at mine.